In order to examine the life-history strategies of key pangasiid catfishes in the Mekong River, the authors collected otoliths from 126 specimens belonging to four species in the Lower Mekong Basin. They analysed the otolith microchemical structure using two methods (Laser Ablation – Inductively Coupled Plasma Mass Spectrometry and Scanning X-ray Fluorescence Microscopy) to identify evidence of diadromy (movements between the ocean and upstream waters).

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